Funny to read all the comments comparing the Z9 with the R3 by people who have used neither. Still, very impressed to see that people know what a camera is worth by reading the spec sheet.

I guess I am old fashioned, but I believe until you use a camera for at least a few weeks, you won't really know how good (or bad) it is. I learned that lesson when I bought the Sony A7 II...haha!
But I am hopeful that this is a really good camera and it will convince people that Nikon makes a really fine camera (and top of the line lenses.) I recently sold my Canon R and have (for the moment) switched my FF camera to Nikon. For those looking for a more affordable FF mirrorless camera, I would look into the Z5 or Z6. I would consider those cameras a better value than the RP or R, and if you don't need the tracking AF and higher FPS, than the Z6 or Z7 (mark I or II) are more affordable choices that the R6 or R5. The "S" lenses that I have tried are also fantastic.
Of course, based on my earlier statements, don't just take the word of someone on the internet! But if you get a chance to try them out, I would. Nikon, alas, in my opinion, has been the victim of a lot of negative propaganda on the internet, quite the opposite of Sony , which has prospered due to that propaganda. Given the choice, I would recommend Nikon over any comparable Sony offering.